<template>
    <view>
        <view class="wanl-product">
            <!-- 普通布局 -->
            <view class="product_list" :class="dataStyle">
                <view class="item" v-for="(item, index) in dataList" :key="index" @tap="handleGoods(item.id)"
                    style="margin: 20rpx 0">
                    <view class="">
                        <image :src="item.image.indexOf('http') == 0 ? item.image : imgUrl + item.image"
                            style="width: 160rpx" mode="widthFix"></image>
                    </view>
                    <view class="content padding-sm">
                        <view class="">
                            <view class="text-cut-2">
                                <text>{{ item.title || item.name }}</text>
                            </view>
                            <view class="goods-tag"> </view>
                        </view>
                        <view class="flex align-center justify-between">
                            <view class="text-red text-bold text-lg">
                                <text class="text-price">{{ item.price || item.original_price }}</text>
                                <text class="text-linePrice f-22" :style="{
                                    'text-decoration': 'line-through',
                                }">{{ item.linePrice || item.price || item.line_original_price }}</text>
                            </view>
                        </view>
                        <view class="jfen flex f-20" v-if="item.integral || item.score">
                            <view class="flex left">
                                <image class="jifen" :src="imageUrl + '/static/images/new/jfen.png'"
                                    mode="scaleToFill" />
                                <text class="jf">{{ item.integral || item.score }}积分 </text>
                            </view>
                            <text class="add" v-if="item.type == 2">+{{ item.money }}</text>
                        </view>
                    </view>
                </view>
            </view>
        </view>
    </view>
</template>

<script>
/**
 * wanlProduct 商品
 * @description 商品组件 深圳前海万联科技有限公司 https://www.wanlshop.com（除万联官方内嵌系统，未经授权严禁使用）
 * @著作权：WanlShop 登记号：2020SR0255711 版本：V1.0.0
 * @property {Array} dataList 列表数据
 * @property {String} dataStyle 列表样式
 * @example <wanl-product />
 */
export default {
    name: "wanlProduct",
    props: {
        dataList: {
            type: Array,
            required: true,
            default: function () {
                return [];
            },
        },
        dataStyle: {
            type: String,
            default: "col-2-20",
        },
        dataType: {
            type: String,
            default: "goods",
        },
    },
    data() {
        return {
            imageUrl: this.$imageUrl || "",
            imgUrl: this.$imgUrl || "",
            addTime: 180,
            leftList: [],
            rightList: [],
            tempList: [],
            children: [],
        };
    },
    watch: {
        copyFlowList(nVal, oVal) {
            // 取差值，即这一次数组变化新增的部分
            let startIndex = Array.isArray(oVal) && oVal.length > 0 ? oVal.length : 0;
            if (nVal.slice(startIndex).length == 0) {
                this.leftList = [];
                this.rightList = [];
                this.tempList = this.cloneData(this.copyFlowList);
            } else {
                this.tempList = this.tempList.concat(this.cloneData(nVal.slice(startIndex)));
            }
            this.splitData();
        },
    },
    mounted() {
        this.tempList = this.cloneData(this.copyFlowList);
        this.splitData();
    },
    computed: {
        // 破坏flowList变量的引用，否则watch的结果新旧值是一样的
        copyFlowList() {
            return this.cloneData(this.dataList);
        },
    },
    methods: {
        async splitData() {
            if (!this.tempList.length) return;
            let rightRect = await this.getRect("#wanl-right-cloumn");
            let leftRect = await this.getRect("#wanl-left-cloumn");
            // 如果左边小于或等于右边，就添加到左边，否则添加到右边
            let item = this.tempList[0];
            if (!item) return;
            item.image = this.$wanlshop.oss(item.image, 102, 0, 1);
            item.comment = this.$wanlshop.toFormat(item.comment, "hundred");
            item.praise = item.comment > 0 ? parseInt((item.praise / item.comment) * 100) : 0;
            if (leftRect.height < rightRect.height) {
                this.leftList.push(item);
            } else if (leftRect.height > rightRect.height) {
                this.rightList.push(item);
            } else {
                // 这里是为了保证第一和第二张添加时，左右都能有内容
                // 因为添加第一张，实际队列的高度可能还是0，这时需要根据队列元素长度判断下一个该放哪边
                if (this.leftList.length <= this.rightList.length) {
                    this.leftList.push(item);
                } else {
                    this.rightList.push(item);
                }
            }
            // 移除临时列表的第一项
            this.tempList.splice(0, 1);
            // 如果临时数组还有数据，继续循环
            if (this.tempList.length) {
                setTimeout(() => {
                    this.splitData();
                }, this.addTime);
            }
        },
        // 复制而不是引用对象和数组
        cloneData(data) {
            return JSON.parse(JSON.stringify(data));
        },
        getRect(selector, all) {
            return new Promise((resolve) => {
                let query = null;
                // 支付宝小程序不能加后面的.in(this)，是它自身的限制
                // #ifndef MP-ALIPAY
                query = uni.createSelectorQuery().in(this);
                // #endif
                // #ifdef MP-ALIPAY
                query = uni.createSelectorQuery();
                // #endif
                query[all ? "selectAll" : "select"](selector)
                    .boundingClientRect((rect) => {
                        if (all && Array.isArray(rect) && rect.length) {
                            resolve(rect);
                        }
                        if (!all && rect) {
                            resolve(rect);
                        }
                    })
                    .exec();
            });
        },
        handleGoods(id) {
            if (this.dataType === "goods") {
                this.onGoods(id);
            } else if (this.dataType === "groups") {
                this.$wanlshop.to(`/pages/apps/groups/goods?id=${id}`);
            } else if (this.dataType === "score") {
                this.$wanlshop.to(`/pages/user/member/details?id=${id}`);
            }
        },
    },
};
</script>

<style lang="scss" scoped>
.wanl-waterfall {
    display: flex;
    flex-direction: row;
    align-items: flex-start;

    .wanl-cloumn {
        display: flex;
        flex: 1;
        flex-direction: column;
        height: auto;
        width: 50%;

        .wanl-image {
            width: 100%;
        }
    }
}

.text-linePrice {
    text-decoration: line-through;
    font-weight: normal;
    color: #ccc;
}

.text-linePrice::before {
    content: "¥";
    font-weight: normal;
    color: #ccc;
    margin-left: 10rpx;
}

.jfen {
    margin-top: 20rpx;

    .left {
        background: #fbe7ce;
        border-radius: 6rpx;
        padding: 0 10rpx 0 0;
    }

    .jifen {
        width: 48rpx !important;
        height: 32rpx !important;
    }

    .add {
        margin-left: 10rpx;
        font-size: 24rpx;
        color: #ea321b;
    }
}
</style>
